Nail said:
This isn't an argument. This is an attempt to understand why someone would write 'melee attack'. After all, there are other kinds of attacks!
In the Special Attacks section, WotC wrote Melee Attack for Disarm, Grapple, Sunder, and Trip.
They wrote Standard Action for Aid Another, Bull Rush, Feint, Overrun, and Turn Undead.
They wrote Full Round Action for Charge.
They wrote Ranged Touch Attack for Throw Splash Weapon.
They did not specify for Two Weapon Fighting, but other sections of rules (not just tables) specify it as part of a Full Round Attack.
The rules within the Special Attack section are crystal clear. One of them just happens to disagree with the table. It matters not WHY they wrote Melee Attack for Sunder, the fact remains that they did write it.
The key here is that any rule that states that something is a Melee Attack, means that it follows ALL of the melee attack rules: AoO, Reach, Damage, Criticals, etc. unless a written rule specifiies otherwise.
I totally understand that the table indicates that a Sunder is a Standard Action. It also indicates that Melee Attacks are a Standard Action.